In a sauce pan, combine the sugars, milk, syrup, butter, salt and peanut butter over medium heat. Stir the mixture until the sugar dissolves. Continue stirring until the mixture begins to bubble around the edges of the pan, for about 12 minutes. Add the pecans and continue stirring until the mixture thickens for about 8 minutes, and it reaches the soft ball stage. (when a small amount of the mixture is dropped into a cup of cold water is forms a soft ball) Remove from the heat and drop by spoonfulls onto wax paper. Let cool. Lift the pralines off the paper with a thin knife.
Yield: 1 1/2 dozen pralines